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1. A clothesline is strung between two posts, and wet clothing weighing 200 N is hung on the line, which sags under the weight of the clothes. If one end of the line is pulled to straighten the line, which of the following would be true?
I. The tension in the rope undergoes a large increase.
II. The tension in the rope undergoes a large decrease.
III. The weight in the rope undergoes a large increase.
A. I onlyB. II onlyC. I and III onlyD. II and III onlyE. I, II, and III
2. The current through a 20Ω resistor connected to a 12V battery is
A. .3 amperes.B. .6 amperes.C. .9 amperes.D. 1.6 amperes.E. 1.9 amperes.
3. When U-235 is fissioned in a nuclear reactor, the nuclear reaction is maintained by
A. heat produced in the reactor.B. the moderator rods.C. radioactive decay products.D. vibrations induced in the U-235.E. neutrons produced in the reaction.
4. The force a magnetic field exerts on an electron is largest when the path of the electron is oriented
A. in the opposite direction from the magnetic field's direction.B. in the same direction as the magnetic field's direction.C. up through the magnetic field at a 45° angle.D. down through the magnetic field at a 45° angle.E. at a right angle to the magnetic field.
5. When a light ray strikes a perfectly reflective mirror at an angle, which of the following happens?
A. The frequency of the light ray changes.B. The wavelength of the light ray changes.C. The velocity of the light ray changes.D. The period of the light ray changes.E. The direction of motion of the light ray changes.
An electron, a proton, and a neutron are located at point (A) above in an electric field. A short period of time passes. At which position as indicated by the letter on the diagram will the proton be located?
A. Point AB. Point BC. Point CD. Point DE. Point E
7. If the pressure acting on an ideal gas that is kept at constant temperature is multiplied by four, its volume
A. triples.B. reduces to 1/3.C. increases by four.D. reduces to 1/4.E. There is not enough information to tell.
8. The electron-volt (eV) is a unit of
A. power.B. voltage.C. current.D. potential.E. energy.
9. A pile driver is raised to a height of 25 m in 10 seconds. It is released and allowed to fall onto a piling. Although guided by a set of rails, the pile driver essentially is in free fall after its release. Which of the following is/ are correct?
I. The power input equals the power output.
II. The PE in equals the KE out.
III. The KE in equals the work out.
A. I onlyB. II onlyC. I and III onlyD. II and III onlyE. I, II, and III only
10. A dog walks 120 m due east, then turns and runs 60 m west. An interesting smell attracts the dog, and it trots 40 m due north. At this point the dog is 85 m northeast of his home. The dog hears his master call him and he runs directly home. Which part of the trip is the largest vector?
A. The eastward legB. The westward legC. The northward legD. The distance from homeE. The distance to home
Which letter above represents a 3λ difference in path length?
A. Position AB. Position BC. Position CD. Position DE. Position E
12. A 1,000 kg car rolls without friction down a hill that is 20 m long and inclined at 15°C from the horizontal. What is the velocity of the car at the bottom of the hill?
A. 2 m/sB. 5 m/sC. 10 m/sD. 20 m/sE. 30 m/s
13. Sound waves cannot travel in
A. air.B. metal.C. vacuum.D. water.E. wood.
14. Consider a light wave that passes from air into a very thick clear glass block that has its opposite internal side mirrored (facing into the glass). The light ray passes into the glass block at an angle greater than 0° and less than 90°, strikes the mirrored surface and reflects back through the glass into the air.
What happens while the light ray is in the glass block but before it strikes the mirrored surface?
A. The frequency of the waves increases.B. The frequency of the waves decreases.C. The wavelength of the waves decreases.D. The velocity of the waves decreases.E. The period of the waves increases.
15. Consider a light wave that passes from air into a very thick clear glass block that has its opposite internal side mirrored (facing into the glass). The light ray passes into the glass block at an angle greater than 0° and less than 90°, strikes the mirrored surface and reflects back through the glass into the air.
What happens when the light ray leaves the glass block after it has struck the mirrored surface?
A. The waves reflect back on the glass.B. The waves increase velocity.C. The waves leave the glass at the same angle at which they entered the glass.D. The angle of refraction is greater than the angle of incidence.E. The angle of reflection from the mirror is equal to the incident angle at which the light struck the glass block.
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